Cutter for mining-machines



(No Model.)

E. E. CARTER. CUTTER FOR MINING MACHINES.

No. 387,050. Patented July 31, 1888.

INVENTOR,

WITNESSES:

my invention, andFigs. 2 vation, at right angles one to the other, ofthe NITED STATES PATENT OFFICE,

EDYVIN E. CARTER, OF KNOXVILLE, ALLEGHENY COUNTY, ASSIGNOR TO JOHN S.SOULLY, OF PITTSBURG, PENNSYLVANIA.

CUTTER FOR MjNlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 387,050, dated July 31,1888.

Application filed April 24, 1888.

To aZZ whom it may concern.-

Be it known that I, EDWIN E. CARTER, a citizen of the United States,residing at Knoxville, in the county of Allegheny and State ofPennsylvania, have invented or discovered a certain new and usefulImprovement in Outters for MiningMachines, of which improve ment thefollowing is a specification.

My invention relates to rotary cutters for drilling or boring into coaland other minerals; and its object is to provide a cutter of such typewhich shall be rapid and effective in operation, free from unduefriction, and adapted to cut-in either direction,so as to be withdrawnin the event of the settling of the material in which it acts. I

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a view in perspective of acutter embodying and 3 views in elesame. i

In thepractice of my invention I form a cut ter, 1, having a centralcutting-point, or preferably, as shown, two cutting-points, 2 2, locatedon oppositesides of an intermediate recess, 3, concentric with thespindle to which the cutter is secured and by which it is rotated.Lateral wings 4 and 6 project from the central portion of the cutterbelow the cut ting'points 2 2, one of said wings,4,being provided withaseries of transverse scoring-edges, 5,separated by intermediateclearing recesses, and the other, 6, with a longitudinal cuttingedge,7,in orsubstantially in line with the leading ends of the scoring-edges5. A stem, 8, formed centrally upon the cutter serves for the attachmentof the same to a suitable head or socket fixed upon the spindle by whichit is driven.

To enable the cutter to operate in either dil Serial No. 271,663. (Nomodel.)

rection, so as to cut out of the bore it held therein by the settling ofthe materia1,the rear sides of the wings 4 and 6 are relieved at their 5ends, forming cutting-edges 9 and 10, which act upon material within andadjoining the circle of the bore when the cutter is fed in reversedirection to its normal niovementin advancing into its work.

In operation the opening which is formed by the preliminary action ofthe cuttingpoints 2 2 is rapidly and freely enlarged to the fulldiameter of the bore by the cutting edges of the wings 4 and 6, thescoring-edges 5 forming concentric ridges, which are broken into coarsefragments and detached by the cuttingedge 7 of the opposite wing. Thecutter may be readily withdrawn if the material settles by rotatingit inthe opposite direction and cutting away the material in its rear by thecut ting-edges 9 and 10.

I claim as my invention and desire to secure by Letters Patent- 1. Acutter having a cuttingpoint orpoints 6 for removing material at andadjoining its center and two lateral wings in a plane below saidcuttiug-points,one ofsaid wings being provided with transversescoring-edges and the other with a longitudinal cutting-edge,substantially as set forth.

2. A cutter having a cutting point or points at or adjacent to itscenter and two lateral wingsprovided with cutting and scoring edges,respectively, each of said wings having a cut- 7 tingedge on its rearside, substantially as set forth.

In testimony whereof I have hereuntoset my hand.

EDWIN E. CARTER. Witnesses:

J. SNOWDEN BELL, R. H. WHITTLESEY.

